using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media.Imaging;
using Comal.Classes;
using InABox.Clients;
using InABox.Core;
using InABox.DynamicGrid;
using InABox.WPF;
using Microsoft.Win32;
using Syncfusion.Linq;
using Button = System.Windows.Controls.Button;
using MessageBox = System.Windows.MessageBox;
using OpenFileDialog = Microsoft.Win32.OpenFileDialog;
using SaveFileDialog = Microsoft.Win32.SaveFileDialog;

namespace PRS.Shared
{
    internal class ScheduleItemGrid : DynamicDataGrid<Schedule>
    {
        private readonly BitmapImage disabled = PRS.Shared.Resources.disabled.AsBitmapImage();

        private readonly BitmapImage tick = PRS.Shared.Resources.tick.AsBitmapImage();

        public ScheduleItemGrid()
        {
            Options.AddRange(DynamicGridOption.RecordCount, DynamicGridOption.SelectColumns, DynamicGridOption.MultiSelect);
            ActionColumns.Add(new DynamicTickColumn<Schedule, bool>(x => x.Active, tick, tick, disabled, CheckClick));
            HiddenColumns.Add(x => x.Active);
            HiddenColumns.Add(x => x.Title);
            HiddenColumns.Add(x => x.DocumentClass);

            AddButton("Export", PRS.Shared.Resources.download.AsBitmapImage(), SaveSchedules);
            AddButton("Import", PRS.Shared.Resources.upload.AsBitmapImage(), LoadSchedules);
        }

        public CoreTable Schedules { get; set; }

        public Type DocumentType { get; set; }
        public Guid DocumentID { get; set; }

        private bool LoadSchedules(Button sender, CoreRow[] rows)
        {
            if (rows.Length != 1)
            {
                MessageBox.Show("Please select only one row to process");
                return false;
            }

            var row = rows.First();

            var dlg = new OpenFileDialog();
            dlg.Filter = "PRS Schedule Files (*.schedule)|*.schedule";
            if (dlg.ShowDialog() == true)
            {
                Progress.Show("");
                var json = File.ReadAllText(dlg.FileName);
                Schedule[] schedules = { };
                try
                {
                    schedules = Serialization.Deserialize<Schedule[]>(json);
                }
                catch (Exception e)
                {
                    Progress.Close();
                    MessageBox.Show("[" + Path.GetFileName(dlg.FileName) + "] is not a valid schedule file!");
                    return false;
                }

                if (!schedules.Any())
                {
                    Progress.Close();
                    MessageBox.Show("[" + Path.GetFileName(dlg.FileName) + "] does not contain any schedules!");
                    return false;
                }

                foreach (var schedule in schedules)
                {
                    schedule.DocumentID = DocumentID;
                    schedule.DocumentClass = DocumentType.EntityName();
                    schedule.ID = Guid.Empty;
                    schedule.Active = false;
                    schedule.DueDate = DateTime.MinValue;
                }

                new Client<Schedule>().Save(schedules, "Imported from [" + Path.GetFileName(dlg.FileName) + "]");
                Progress.Close();
                MessageBox.Show(string.Format("{0} schedules loaded from [{1}]", schedules.Length, Path.GetFileName(dlg.FileName)));
            }

            return true;
        }

        private bool SaveSchedules(Button sender, CoreRow[] rows)
        {
            if (rows.Any())
            {
                MessageBox.Show("Please select at least one schedule before Exporting!");
                return false;
            }

            var names = new List<string>();
            rows.ForEach(r => names.Add(r.Get<Schedule, string>(c => c.Title)));
            var filename = DocumentType.Name + " (" + string.Join(" + ", names) + ")";
            Path.GetInvalidFileNameChars().ForEach(c => filename = filename.Replace(c.ToString(), ""));
            Path.GetInvalidPathChars().ForEach(c => filename = filename.Replace(c.ToString(), ""));

            var dlg = new SaveFileDialog();
            dlg.Filter = "PRS Schedule Files (*.schedule)|*.schedule";
            dlg.FileName = filename + ".schedule";
            dlg.AddExtension = false;
            if (dlg.ShowDialog() == true)
            {
                Progress.Show("");

                Filter<Schedule> filter = null;
                foreach (var schedule in SelectedRows)
                    if (filter == null)
                        filter = new Filter<Schedule>(x => x.ID).IsEqualTo(schedule.Get<Schedule, Guid>(x => x.ID));
                    else
                        filter = filter.Or(x => x.ID).IsEqualTo(schedule.Get<Schedule, Guid>(x => x.ID));

                var schedules = new Client<Schedule>().Load(filter);
                foreach (var schedule in schedules)
                {
                    schedule.DocumentID = DocumentID;
                    schedule.DocumentClass = DocumentType.EntityName();
                    schedule.ID = Guid.Empty;
                    schedule.Active = false;
                    schedule.DueDate = DateTime.MinValue;
                }

                var json = Serialization.Serialize(schedules);
                File.WriteAllText(dlg.FileName + ".schedule", json);
                Progress.Close();
                MessageBox.Show(string.Format("{0} schedules saved to [{1}]", SelectedRows.Length, Path.GetFileName(dlg.FileName)));
            }

            return false;
        }

        private bool CheckClick(CoreRow row)
        {
            var Due = row.Get<Schedule, DateTime>(x => x.DueDate);
            if (Due.Equals(DateTime.MinValue))
            {
                MessageBox.Show("Schedule must have a due date!");
                return false;
            }

            using (var client = new Client<Schedule>())
            {
                var schedule = client.Query(
                    new Filter<Schedule>(x => x.ID).IsEqualTo(row.Get<Schedule, Guid>(x => x.ID)),
                    new Columns<Schedule>(x => x.ID).Add(x => x.Active)).ToObjects<Schedule>().FirstOrDefault();
                schedule.Active = !schedule.Active;
                client.Save(schedule, schedule.Active ? "Activated Schedule" : "Disabled Schedule");
            }

            return true;
        }

        public override void ConfigureColumns(DynamicGridColumns columns /*, bool dolookups = true */)
        {
            var colDocType = columns.Where(x => x.ColumnName.Equals("DocumentType")).FirstOrDefault();
            if (colDocType != null)
                columns.Remove(colDocType);

            var colRollover = columns.Where(x => x.ColumnName.Equals("Rollover")).FirstOrDefault();
            if (colRollover != null)
                colRollover.Lookups = new Dictionary<object, object>
                {
                    { ScheduleRollover.FromActualDate, "From Actual" },
                    { ScheduleRollover.FromDueDate, "From Due" }
                };

            var colPeriod = columns.Where(x => x.ColumnName.Equals("Period")).FirstOrDefault();
            if (colPeriod != null)
                colPeriod.Lookups = new Dictionary<object, object>
                {
                    { SchedulePeriod.Year, "Years" },
                    { SchedulePeriod.Month, "Months" },
                    { SchedulePeriod.Week, "Weeks" },
                    { SchedulePeriod.Day, "Days" },
                    { SchedulePeriod.Hour, "Hours" },
                    { SchedulePeriod.Minute, "Minutes" }
                };

            var colTrigger = columns.Where(x => x.ColumnName.Equals("Trigger")).FirstOrDefault();
            if (colTrigger != null)
                colTrigger.Lookups = new Dictionary<object, object>
                {
                    { ScheduleTrigger.Distance, "Distance Travelled" },
                    { ScheduleTrigger.Usage, "Usage Time" },
                    { ScheduleTrigger.Counter1, "Counter 1" },
                    { ScheduleTrigger.Counter2, "Counter 2" },
                    { ScheduleTrigger.Counter3, "Counter 3" },
                    { ScheduleTrigger.Counter4, "Counter 4" },
                    { ScheduleTrigger.Counter5, "Counter 5" }
                };

            var colScheduleType = columns.Where(x => x.ColumnName.Equals("ScheduleType")).FirstOrDefault();
            if (colScheduleType != null)
                colScheduleType.Lookups = new Dictionary<object, object>
                {
                    { ScheduleType.Job, "Job" },
                    { ScheduleType.Task, "Task" }
                };


            base.ConfigureColumns(columns /*,dolookups */);
        }

        //protected override void DeleteItem(DataRow row)
        //{
        //	Items.Remove(Items[row.Index]);
        //}

        //protected override ScheduleItem LoadItem(DataRow row)
        //{
        //	return Items[row.Index];
        //}

        //protected override DataTable Reload(Dictionary<string, object> criteria, List<string> columns, string sort)
        //{
        //	criteria.Add("DocumentID", DocumentID);
        //	return base.Reload(criteria, columns, sort);
        //}

        protected override void Reload(Filters<Schedule> criteria, Columns<Schedule> columns, ref SortOrder<Schedule> sort,
            Action<CoreTable, Exception> action)
        {
            criteria.Add(new Filter<Schedule>(x => x.DocumentID).IsEqualTo(DocumentID));
            sort = new SortOrder<Schedule>(x => x.DueDate);
            base.Reload(criteria, columns, ref sort, action);
        }

        protected override Schedule CreateItem()
        {
            if(DocumentType is null)
            {
                throw new Exception("Cannot create item when DocumentType is null.");
            }

            var schedule = base.CreateItem();
            schedule.DocumentClass = DocumentType.EntityName();
            schedule.DocumentID = DocumentID;
            if (DocumentType == typeof(CustomModule) || DocumentType == typeof(ScheduledScript))
                schedule.ScheduleType = ScheduleType.None;
            return schedule;
        }

        public override void SaveItem(Schedule item)
        {
            if(DocumentType is not null)
            {
                item.DocumentClass = DocumentType.EntityName();
            }
            else
            {
                if (string.IsNullOrWhiteSpace(item.DocumentClass))
                {
                    throw new Exception("Cannot save item when DocumentType is null.");
                }
            }
            base.SaveItem(item);
        }

        protected override void ReconfigureEditors(DynamicEditorGrid grid, Schedule[] items)
        {
            base.ReconfigureEditors(grid, items);

            var frequency = grid.FindEditor("Frequency");
            if (frequency != null)
            {
                var freq = (int)frequency.GetValue("Frequency");
                var period = grid.FindEditor("Period");
                period?.SetEnabled(freq > 0);
                var due = grid.FindEditor("DueDate");
                due?.SetEnabled(freq > 0);
            }

            var threshold = grid.FindEditor("Threshold");
            if (threshold != null)
            {
                var thresh = (int)threshold.GetValue("Threshold");
                var trigger = grid.FindEditor("Trigger");
                trigger?.SetEnabled(thresh > 0);
                var next = grid.FindEditor("DueThreshold");
                next?.SetEnabled(thresh > 0);
            }

            var scheduleTypeEditor = grid.FindEditor("ScheduleType");
            if(scheduleTypeEditor != null)
            {
                var scheduleType = (ScheduleType)scheduleTypeEditor.GetValue("ScheduleType");
                var taskTypeEditor = grid.FindEditor(nameof(Schedule.KanbanType));
                taskTypeEditor?.SetEnabled(scheduleType == ScheduleType.Task);
            }
        }

        protected override Dictionary<string, object?> EditorValueChanged(IDynamicEditorForm editor, Schedule[] items, string name, object value)
        {
            return base.EditorValueChanged(editor, items, name, value);
        }

        protected override BaseEditor? GetEditor(object item, DynamicGridColumn column)
        {
            var types = new List<Type> { typeof(CustomModule), typeof(ScheduledScript), typeof(Employee), typeof(Equipment) };

            var columns = new List<string> { "ScheduleType" };
            var schedule = (Schedule)item;

            var documentType = schedule.DocumentType();
            if (documentType == typeof(CustomModule) || documentType == typeof(ScheduledScript))
                columns.AddRange(new[]
                {
                    "Description", "LeadTime", "EmployeeLink.ID", "ManagerLink.ID", "Report.ID", "Threshold", "Trigger", "DueThreshold", "Rollover",
                    "QAForm"
                });

            else if (documentType == typeof(Employee))
                columns.AddRange(new[] { "Description", "EmployeeLink.ID", "Threshold", "Trigger", "DueThreshold" });

            else if (documentType == typeof(Customer))
                columns.AddRange(new[] { "Threshold", "Trigger", "DueThreshold" });


            if (types.Contains(documentType) && columns.Contains(column.ColumnName))
                return new NullEditor();
            return base.GetEditor(item, column);
        }

        public override DynamicEditorPages LoadEditorPages(Schedule item)
        {
            var pages = base.LoadEditorPages(item);
            foreach (var page in pages.ToArray())
            {
                if (page is IDynamicOneToManyGrid<Schedule, Kanban> && item.ScheduleType != ScheduleType.Task)
                    pages = new DynamicEditorPages(pages.Where(x => x != page));
                else if (page is IDynamicOneToManyGrid<Schedule, Job> && item.ScheduleType != ScheduleType.Job)
                    pages = new DynamicEditorPages(pages.Where(x => x != page));
            }
            return pages;
        }

        protected override void DefineLookups(ILookupEditorControl sender, Schedule[] items)
        {
            base.DefineLookups(sender, items);
        }
    }
}